If your windows open outwards, then your blinds should be mounted above the window.

In this case we recommend allowing an extra 25cm in height and 2 cm for each side.

If you have sash or sliding windows, then you can choose between mounting the blinds above or in the window reveal.

Remember, that if the blinds are mounted in the window reveal then you will see them from the inside of the room.

To measure for blinds installed inside the window reveal, measure the height and the width, In this case you simply measure the window and subtract 1 cm from each side.